NFT 102. BattleCats

1. Create a new file "BattleCats"

// SPDX-License-Identifier: MIT
pragma solidity ^ 0.8.23;

import"./ERC721.sol";

contract SuperMarioWorld is ERC721 {

    string public name;
    string public symbol;
    uint256 public tokenCount;

    constructor(string memory _name, string memory _symbol){
        name = _name;
        symbol = _symbol;
    }

    // tokenURI
    // mint
    // supportsInterface
}

2. Adding TokenURI

// SPDX-License-Identifier: MIT
pragma solidity ^ 0.8.23;

import"./ERC721.sol";

contract SuperMarioWorld is ERC721 {

    string public name;
    string public symbol;
    uint256 public tokenCount;

    mapping(uint256 => string) private _tokenURIs;

    constructor(string memory _name, string memory _symbol){
        name = _name;
        symbol = _symbol;
    }

    // Returns a URL that points to the metadata
    function tokenURI(uint256 tokenId) public view returns (string memory) {
        require(_owners[tokenId] != address(0), "TokenId does not exist");
        return _tokenURIs[tokenId];
    }

    // mint
    // supportsInterface
}

3. Adding Mint

// SPDX-License-Identifier: MIT
pragma solidity ^ 0.8.23;

import"./ERC721.sol";

contract SuperMarioWorld is ERC721 {

    string public name;
    string public symbol;
    uint256 public tokenCount;

    mapping(uint256 => string) private _tokenURIs;

    constructor(string memory _name, string memory _symbol){
        name = _name;
        symbol = _symbol;
    }

    // Returns a URL that points to the metadata
    function tokenURI(uint256 tokenId) public view returns (string memory) {
        require(_owners[tokenId] != address(0), "TokenId does not exist");
        return _tokenURIs[tokenId];
    }

    // Creates a new NFT inside our collection 
    function mint(string memory _tokenURI) public {
        

        tokenCount += 1; //tokenId
        _balances[msg.sender] += 1;
        _owners[tokenCount] = msg.sender;
        _tokenURIs[tokenCount] = _tokenURI;

        emit Transfer(address(0), msg.sender, tokenCount);
    }
    
    // supportsInterface
}

4. Updating ERC165 Interface

// SPDX-License-Identifier: MIT
pragma solidity ^ 0.8.23;

import"./ERC721.sol";

contract SuperMarioWorld is ERC721 {

    string public name; // ERC721 Metatdata
    string public symbol; // ERC721 Metatdata
    uint256 public tokenCount;

    mapping(uint256 => string) private _tokenURIs;

    constructor(string memory _name, string memory _symbol){
        name = _name;
        symbol = _symbol;
    }

    // Returns a URL that points to the metadata
    function tokenURI(uint256 tokenId) public view returns (string memory) { // ERC721 Metatdata
        require(_owners[tokenId] != address(0), "TokenId does not exist");
        return _tokenURIs[tokenId];
    }

    // Creates a new NFT inside our collection 
    function mint(string memory _tokenURI) public {
        

        tokenCount += 1; //tokenId
        _balances[msg.sender] += 1;
        _owners[tokenCount] = msg.sender;
        _tokenURIs[tokenCount] = _tokenURI;

        emit Transfer(address(0), msg.sender, tokenCount);
    }

    function supportsInterface(bytes4 interfaceId) public override returns(bool){
        return interfaceId == 0x80ac58cd || interfaceId == 0x5b5e139f;
    }

5. Creating Metadata

1. create a new folder "Metatdata" and move the picture "cat bros" and "bean cats" inside the folder.
2. creat a file "BeanCats.json" and "CatBros.json" in the folder "Metadata"

6. Uploading BattleCats

1. Pinata
2. upload the image(metadata), and copy the CIP

piñata x metadata

3. paste into the json file, "image"：https://ipfs.io/ipfs/Qmeu3GmtGRS5S9WakQrssZytQr5VSuL4G9mxFG46gu5jgB",
4. upload the file "CatBros.json" to piñata as well

7. Configuring Hardhat

1. open the file, "hardhat config.js"
2. create a .env file
3. terminal run "npm install dotenv"

8. Getting A Private Key and RPC

1. go to Vanity ETH, scroll down and click "generate"
2. double click the private key
3. Polygon RPC: https://rpc-mumbai.maticvigil.com/

9. Updating Deploy Script

• open the file "deploy.js" in the folder "scripts"

10. Deploy CatBros

真哭哭 卡關>^<

[Reference]

Eattheblocks - NFT 101

Eattheblocks - GitHub

Bean Cat-The Battle Cats by Aauroz on DeviantArt

The Battle Cats Cat Bros cursor – Custom Cursor